U.S. patent number 3,834,463 [Application Number 05/336,849] was granted by the patent office on 1974-09-10 for sensitive sprinkler.
This patent grant is currently assigned to International Telephone and Telegraph Corporation. Invention is credited to Roger L. Allard, Rudolph W. Kalns, William J. Malinowski.
United States Patent |
3,834,463 |
Allard , et al. |
September 10, 1974 |
SENSITIVE SPRINKLER
Abstract
A sensitive sprinkler includes a body having an inlet port
coupled to a fluid supply line and an outlet orifice having a
deflector mounted adjacent thereto to deflect fluid flowing through
said sprinkler. A rupture disc valve is positioned in the fluid
flow path between the inlet port and outlet orifice to block fluid
flow through the flow path. An explosive squib is mounted in the
fluid flow path upstream of the rupture disc so that when exploded
an expansive gas directs a pressure through said fluid to rupture
the disc. A fire detector assembly electrically activates the squib
substantially immediately upon detection of a fire.
Inventors: |
Allard; Roger L. (North
Smithfield, RI), Malinowski; William J. (Pembroke, RI),
Kalns; Rudolph W. (Pembroke, RI) |
Assignee: |
International Telephone and
Telegraph Corporation (Nutley, NJ)
|
Family
ID: |
23317940 |
Appl.
No.: |
05/336,849 |
Filed: |
February 28, 1973 |
Current U.S.
Class: |
169/28;
169/37 |
Current CPC
Class: |
A62C
37/10 (20130101) |
Current International
Class: |
A62C
37/10 (20060101); A62C 37/08 (20060101); A62c
035/08 () |
Field of
Search: |
;169/28,37,42 ;340/228.1
;337/373 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: King; Lloyd L.
Assistant Examiner: Kashnikow; Andres
Attorney, Agent or Firm: O'Halloran; John T. Lombardi, Jr.;
Menotti J. Van Der Sluys; Peter
Claims
We claim:
1. A sensitive sprinkler for a fire protection system and adapted
to be coupled to a pressurized fluid supply line, comprising in
combination:
a sprinkler body having an inlet adapted for coupling to said fluid
supply line and an outlet for providing fluid, said sprinkler body
defining a fluid flow path between
said inlet and said outlet;
a deflector mounted adjacent said outlet to deflect and distribute
fluid from said outlet;
means providing a rupture disc valve positioned in said fluid flow
path between said inlet and said outlet to block fluid flow through
said flow path;
a housing positioned upstream from the rupture disc valve and
extending across the axis of the valve;
a directional opening formed in said housing and directed
downstream towards the rupture disc valve;
an explosive squib mounted in said housing for providing an
expansive gas upon activation which gas is directed through said
directional opening to exert pressure against said rupture disc
valve through the fluid upon explosion whereby the disc valve is
ruptured; and
means providing a detector assembly for detecting a fire and for
electrically activating said squib substantially immediately upon
detection of a fire so as to provide extreme sensitivity in
responding to fires by said sprinkler.
2. The combination in accordance with claim 1 wherein said detector
assembly is positioned remote from said sprinkler.
3. The combination in accordance with claim 1 wherein said detector
assembly comprises a heat sensitive mercury switch that expands
upon detection of heat to close an electrical circuit to explode
said squib.
4. The combination in accordance with claim 1 wherein said detector
assembly comprises a smoke detector for detecting smoke due to a
fire.
5. The combination in accordance with claim 1 wherein said detector
assembly comprises an ionization detector for detecting ions
produced by a flame due to a fire.
6. The combination in accordance with claim 1 wherein said housing
is mounted in said fluid flow path and said fluid flow path defines
a dual path that divides so that fluid flows around each side of
said housing before joining together again before said rupture
disc.
7. A sensitive sprinkler as described in claim 1, wherein said
detector assembly comprises:
an electrical circuit including a battery coupled via a first
unidirectional conducting diode to charge a capacitor and solar
cell coupled serially with a second unidirectional conducting diode
which is poled to oppose the current flow through said first diode
and that further includes a capacitor mounted between the junction
of the said diodes and the junctions of said battery and said solar
cell to receive a charge from both said battery and said solar cell
with one of said devices being a standby for the other; and
a heat sensitive switch connecting said squib to said capacitor,
whereby the switch closes at a predetermined temperature and the
capacitor is discharged through the squib causing the squib to be
activated.
8. An assembly attachment for a sprinkler having a fusible link,
which attachment renders said sprinkler sensitive in response to
fires comprising in combination:
an explosive squib mounted on said attachment for providing a
molten slag when activated;
means for mounting said attachment on said sprinkler so that said
squib directs said molten slag onto said fusible link when
activated; and
fire detecting means electrically coupled to activate said squib
upon detection of a fire.
9. An assembly attachment as described in claim 8, wherein said
fire detecting means is mounted on said attachment and is
self-powered.
10. An assembly attachment as described in claim 8, wherein said
fire detecting means includes:
an electronic circuit including a self-contained power source and a
capacitor connected to be charged by said power source; and
means for connecting said explosive squib to said capacitor in
response to detection of a fire so that the capacitor is discharged
through the explosive squib causing the explosive squib to be
detonated.
11. An assembly attachment as described in claim 8, wherein said
fire detecting means comprises:
an electrical circuit including a battery coupled via a first
unidirectional conducting diode to charge a capacitor and solar
cell coupled serially with a second unidirectional conducting diode
which is poled to oppose the current flow through said first diode
and that further includes a capacitor mounted between the junction
of the said diodes and the junctions of said battery and said solar
cell to receive a charge from both said battery and said solar cell
with one of said devices being a standby for the other; and
switch means for connecting said squib to said capacitor in
response to a fire, whereby the switch closes at a predetermined
temperature and the capacitor is discharged through the squib
causing the squib to be detonated.
12. A sensitive sprinkler for a fire protection system adapted to
be coupled to a pressurized fluid supply line, comprising:
a sprinkler body having an inlet adapted for coupling to said fluid
supply line and an outlet for providing fluid,
said sprinkler body defining a fluid flow path between said inlet
and said outlet;
a deflector mounted adjacent said outlet to deflect and distribute
fluid from said outlet;
means providing a rupture disc valve positioned in said fluid flow
path between said inlet and said outlet to block fluid flow through
said flow path;
an explosive squib mounted in said fluid flow path upstream of said
rupture disc for providing an expansive gas upon activation to
direct pressure against said rupture disc through said fluid upon
explosion to rupture said disc;
an electrical circuit including a battery coupled via a first
unidirectional conducting diode to charge a capacitor and solar
cell coupled serially with a second unidirectional conducting diode
which is poled to oppose the current flow through said first diode
and that further includes a capacitor mounted between the junction
of the said diodes and the junctions of said battery and said solar
cell to receive a charge from both said battery and said solar cell
with one of said devices being a standby for the other; and
a heat sensitive switch connecting said squib to said capacitor,
whereby the switch closes at a predetermined temperature and the
capacitor is discharged through the squib causing the squib to be
detonated.
13. A sensitive sprinkler for a fire protection system adapted to
be coupled to a pressurized fluid supply line, comprising:
a sprinkler body having an inlet adapted for coupling to said fluid
supply line and an outlet for providing fluid, said sprinkler body
defining a fluid flow path between said inlet and outlet;
deflector means mounted adjacent said outlet for deflecting and
distributing fluid from said outlet;
means for blocking the flow of fluid through said sprinkler body;
electrically actuated explosive means for opening said blocking
means;
an electronic circuit including a self-contained power source and a
capacitor connected to be charged by said power source; and
fire detecting means for connecting said explosive means to said
capacitor in response to detection of a fire so that the capacitor
is discharged through the explosive means causing the explosive
means to be detonated and the blocking means immediately opened
upon the detection of a fire thereby providing a sprinkler having
extreme sensitivity for rapidly extinguishing a fire.
14. A sensitive sprinkler as described in claim 13, wherein the
self-contained power source comprises a battery and a solar cell
each connected to charge the capacitor and provide a standby power
source for the other.
15. A sensitive sprinkler for a fire protection system as described
in claim 13, wherein the electronic circuit includes:
a battery coupled via a first unidirectional conducting diode to
charge a capacitor and solar cell coupled serially with a second
unidirectional conducting diode which is poled to oppose the
current flow through said first diode and that further includes a
capacitor mounted between the junction of the said diodes and the
junctions of said battery and said solar cell to receive a charge
from both said battery and said solar cell with one of said devices
being a standby for the other.
16. A sensitive sprinkler for a fire protection system as described
in claim 13, wherein the blocking means includes a fusible element
and the explosive means is spaced from the blocking means and
positioned to direct a molten slag onto the fusible element which
adheres to the fusible element and causes it to rapidly melt.
17. A sensitive sprinkler for a fire protection system as described
in claim 13, wherein the blocking means includes a rupturable disc
valve and the explosive means is disposed within a housing
positioned within the fluid and across the axis of the disc valve
said housing having an opening directed towards the rupturable disc
valve to direct the force of the explosive means towards the disc
valve.
Description
BACKGROUND OF THE INVENTION
In automatic sprinkler systems for extinguishing fires, it is
important that the sprinkler system be sensitive so as to respond
rapidly to a fire. Many automatic sprinkler systems include a valve
support and releasing device that includes parts that are held
together by solder. At a predetermined temperature, the solder
melts and the valve supports separate releasing the water. Such
systems may be too slow under certain conditions. The sprinklers
are typically mounted in a ceiling which may be remote from a fire
in the same enclosure. Consequently extensive damage to persons or
property may be done before such automatic sprinkler systems turn
on.
OBJECTS OF THE INVENTION
It is an object of this invention to provide a new and improved
sprinkler.
It is another object of this invention to provide an improved
sprinkler that is extremely sensitive to detection of fires to
release fluid.
It is a further object of this invention to provide a sensitive
sprinkler including a fire detector assembly that may be mounted
remote from the sprinkler but electrically coupled thereto and
close to a possible fire location.
SUMMARY OF THE INVENTION
A sensitive sprinkler includes an inlet port and an outlet orifice
and having a body that defines a fluid flow path between the inlet
port and the outlet orifice. A rupture disc valve is positioned in
said fluid flow path between the inlet port and outlet orifice to
block fluid flow through the flow path. An explosive squib is
mounted in said fluid flow path upstream of the rupture disc for
providing an expansive gas upon activation to direct pressure
against the rupture disc through the fluid to rupture the disc. A
detector assembly for detecting a fire and electrically activate
the squib is provided to insure extreme sensitivity in responding
to fires.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features that are considered to be characteristic of this
invention are set forth with particularity in the appended claims.
The invention itself, both as to organization and method of
operation, as well as advantages thereof, will best be understood
by referring to the accompanying drawings and the following
description in which:
FIG. 1 is a sectional view of a sensitive sprinkler embodying the
present invention and in which the sprinkler is shown in an "off"
position;
FIG. 2 is a bottom view of the sensitive sprinkler shown in FIG.
1;
FIG. 3 is a broken sectional view of a portion of the sprinkler
shown in FIG. 1 taken along section line 3--3;
FIG. 4 is a schematic circuit diagram of the fire detector assembly
incorporated into the sprinkler of FIG. 1; and
FIG. 5 is a sectional front view illustrating another embodiment of
the invention.
DETAILED DESCRIPTION
Referring to FIG. 1, a sensitive sprinkler 10, which is shown in a
pendant position, includes a body 12 having an inlet port 14 that
is threaded so as to be connected to a source of pressurized fluid
(not shown). The sprinkler body 12 may for example be formed by a
casting of a suitable material, such as bronze. The sprinkler body
12 also includes an outlet portion having a tapering aperture
formed centrally therein to define an outlet orifice or nozzle 18
for said sprinkler. The outlet orifice portion 18 is threaded so as
to be mated to the threaded open end of the sprinkler body 12 so as
to secure the outlet portion 18 to the sprinkler body 12. Mounted
adjacent the orifice 18 is a deflector 20. The deflector 20, which
may be of a conventional type, as shown in FIG. 2, is spaced from
the orifice 18 and positioned perpendicular to the projected axis
of fluid flow passage by a yoke 22. The deflector 20 is secured to
the yoke by means of a rivet 24. The yoke, which is generally
U-shaped, is in turn fastened onto the orifice member 18 by a force
fit.
Positioned upstream of the orifice 18 is a rupture disc valve 26.
The rupture disc 26 may, for example, comprise a stainless steel
disc, an aluminum disc or a copper disc or any other suitable type
disc. The rupture disc is positioned into intimate contact with a
bearing surface 28 on the sprinkler body 12 by means of a retaining
ring 30. The outlet orifice member 18 holds the retaining ring 30
pressed against the rupture disc 26 so as to block any fluid flow
through a fluid flow path.
The fluid flow path is defined by the inlet port 14, the outlet
nozzle 18 as well as a forked intermediate section 31. As shown in
FIG. 3, the intermediate section includes branches 32 and 33 that
separate and then join together again in front of the rupture disc
26.
An explosive squib 34 is mounted directly in the fluid flow path
and at the axial center thereof in a housing 36. The squib 34 is
held in the housing 36 by means of an annular retainer screw. The
squib 34 is an explosive device that produces an expanding gas when
activated. The expanding gas is directed to rupture the disc 26 by
means of a directional opening 38 in the housing 36. The expanding
gas may also be used to operate a latch and hence open a valve
rather than rupture a disc.
A fire detector assembly 40 is mounted on a flange 42. The flange
42 is held onto the sprinkler body by means of screws 43, as shown
in FIG. 2. The fire detector assembly 40 includes a mercury switch
or thermostat 46 that is protected by a guard 48. The mercury
switch 46 is mounted in the flange 42 adjacent a circuit board 50
that contains other components of the fire detector assembly 40.
Also mounted on the flange 42 is a lens 44 which may be used to
direct light on a solar cell array 48. The fire detector assembly
40 is coupled to activate the squib 34 via electrically conductive
wires 52 that penetrate through the aperture in the retainer screw
37 to the squib 34. This configuration permits the easy replacement
and servicing of the squib 34, the disc 26, and the detector 40 but
of course these also may be a single unit.
A schematic circuit diagram of the fire detector assembly 40, which
includes the components on the circuit board 50, is shown in FIG.
4. The fire detector assembly 40 includes a battery or first energy
source 56 having its positive potential terminal coupled through a
resistor 58 and a first unilateral conducting diode 60 to one plate
of a capacitor 62. The diode 60 is poled to permit the battery 56
to charge the capacitor 62 through the resistor 58. A second energy
source comprising the solar cell array 48 is coupled via a second
unilateral conducting diode 66 to the capacitor 62. The diodes 60
and 66 are poled in opposition to each other with the
aforementioned plate of the capacitor 62 coupled to the junction of
the cathode of these diodes. The other plate of the capacitor 62 is
coupled to the junction of the negative terminal of the battery 56
and the solar cell array 48. The capacitor 62 is electrically
coupled directly across the series combination of the thermostat 46
and the squib 34. The thermostat 46 includes mercury 47 that
expands to cause the terminal 70 to make electrical contact with
the terminal 72 and thereby cause the capacitor 62 to discharge
through the mercury in the thermostat 46 to cause the squib 34 to
fire.
In addition to the fire detector assembly 40, another fire detector
74 is shown in FIG. 1. The detector 74 is located remote from the
sprinkler 10 and is coupled to fire the squib 34 by means of
electrical conductors 76. The detector 74 may, for example, be
located on the wall of an enclosure or near any potentially
hazardous location. Thus the detector 74 can respond rapidly to a
fire and transmit the response electrically to fire the explosive
squib 34. The detector 74 may, for example, comprise a heat
sensitive thermostatic switch similar to the thermostat 46.
Alternatively, the detector 74 may be comprised of a smoke
detector, or other type of detectors such as ionization or
photoelectric. Furthermore, the detector 74 may comprise all three
or more or any combination thereof if desired. The detector 74 may
be utilized along with the thermostat 46 or in place of this
thermostat. The operational status of the electrical components of
both the sprinkler and the detectors are capable of being
monitored.
OPERATION
The sensitive sprinkler 10 is mounted in an enclosure, such as a
room, in the ceiling. The local detector assembly 40 is mounted on
the sprinkler 10 and additionally a detector 74 may be located
remote from the sprinkler 10. Water from a pressurized source
enters the inlet port 14 and fills the fluid flow path of the
sprinkler 10 but the rupture disc valve 26 prevents the water from
flowing through the sprinkler 10. The capacitor 62, in the
schematic diagram of FIG. 4, charges up to the higher potential of
either the battery 56 or the solar cell array 48. The battery 56
and the solar cell array 48 are isolated from each other due to the
isolating effects of the diodes 60 and 66, which are poled in
opposite directions to each other. When a predetermined heat is
detected by the thermostat 46, the mercury 47 therein expands to
cause the mercury to bridge the open circuit gap between the
terminals 70 and 72. When this occurs, the capacitor 62 is
connected across the squib 34. The capacitor 62 therefore
discharges into the squib 34 and causes the squib 34 to explode. In
the explosion, the squib 34 produces an expanding gas which is
directed by the opening 38 in the squib housing 36 toward the
rupture disc valve 26. The incompressibility of the water between
the squib 34 and the rupture disc 26 transfers the force produced
by the expanding gas to the rupture disc 26 and the disc 26
ruptures. The rupturing of the disc 26 opens the fluid flow path
from the inlet port 14 to the orifice 18 and water flows to put out
the fire.
The thermostat 46 is extremely sensitive to heat increases and this
response is transmitted rapidly by the electrical conductors 52.
The explosion produced by the electrical conductors 52 in the squib
34 to rupture the disc valve 26 is also an extremely rapid response
to the detection of a fire by the sensitive sprinkler 10. Thus
extreme sensitivity is provided by a sprinkler 10 embodying the
invention.
It is to be noted that the inclusion of the two energy sources,
namely, the battery 56 and the solar cell array 48, provide a
backup to fire the squib 34. Thus, as the battery 56 ages and
lowers the voltage to which the capacitor 62 would be charged, the
solar cell array 48 effectively charges the capacitor 62 to
maintain optimum operating conditions in the fire detector
assembly.
ANOTHER EMBODIMENT OF THE INVENTION
In FIG. 5, there is shown another embodiment of the invention. In
this embodiment of the invention detector assembly attachment 80 is
attached to a sprinkler 82 that is already installed in a building.
Thus existing sprinklers may be made sensitive by the use of the
attachment 80. The sprinkler 82 may, for example, be a pendant
sprinkler of the solder type. Such a sprinkler is of the fusible
link type and includes a threaded inlet port 84 that is attached to
a source of pressurized fluid (not shown). A fluid flow path in the
body 85 of the sprinkler 82 is blocked by a button disc 86. The
disc 86 is held in place by a strut 88 that is mounted between a
hook 90 and the disc 86. The hook 90 is held under tension by
connecting the other end thereof to a bell shaped key 92 that is
soldered to a bell shaped heat collector 94.
The detector assembly attachment 80 includes a bracket arm 96 that
includes a clamp 98 that attaches to the body 85 of the sprinkler
82. The clamp 98 is pivotally connected together at one end and
includes a pair of eye holes 100 and 102 at the other end. One of
the eye holes 100 is threaded and a bolt 104 is inserted through
the eye hole 102 to be screwed into the eye hole 100 to securely
fasten the attachment 80 to the sprinkler 82.
A fire detector portion of the attachment 80 includes an explosive
squib 106 that is positioned opposite the collector 94. A
thermostat 108 that is protected by a guard 110 detects heat to
cause the squib 106 to fire. The fire detector portion of the
attachment 80 may, for example, be similar to that shown in FIGS. 1
and 4 and consequently will not be described in detail.
When the thermostat 108 detects heat produced by a fire, the squib
106 is fired and the explosion therein causes a molten slag to
impinge on the collector 94. The molten slag melts the solder
holding the key 92 to the collector 94 and the two members
separate. The hook 90 is released from tension and the strut 88
falls away from the button disc. The fluid flow path through the
sprinkler 82 is therefore opened and fluid flows to put out the
fire.
It is to be noted that the explosive squib 106 ejects a molten slag
rather than an expanding gas. The molten slag will adhere to any
surface, but the bell shape of the collector 94 is efficient in
collecting the heat from the molten slag. Thus the attachment 80
renders existing sprinklers sensitive and replacement of existing
sprinklers is not necessary.
Thus in accordance with the invention, a sensitive sprinkler is
provided. A sprinkler may either be rendered sensitive by including
an attachment thereto or the sprinkler may be a unitary
structure.
While the principles of the invention have been described in
connection with specific structure it is to be clearly understood
that this description is made only by way of example and not as a
limitation to the scope of our invention as set forth in the
objects thereof and in the accompanying claims.
* * * * *